I think that the l.p. light should be on the same circuit as the running lights. The bulb may be bad or a wire or plug may be off due to snow/ice build-up or dirt/mud-- Good luck P.S.Those damn license plate lights are causing alot of people to get pulled over-- WARNING!!! The cops love to use that reason to to stop you to see if you're drinking- Happened to me, I just barely passed the breathalizer test-- Fixed it the next day-